mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-11 13:36:13 +03:00
This fixes indexing the StringView before knowing if the index
is valid. This did not crash until the changes from 13406b8
which added runtime checks for StringView indexing.
648 lines
16 KiB
C++
648 lines
16 KiB
C++
/*
|
|
* Copyright (c) 2021, Peter Elliott <pelliott@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <AK/Format.h>
|
|
#include <AK/HashMap.h>
|
|
#include <AK/LexicalPath.h>
|
|
#include <AK/String.h>
|
|
#include <AK/StringBuilder.h>
|
|
#include <AK/Utf8View.h>
|
|
#include <AK/Vector.h>
|
|
#include <LibCore/ArgsParser.h>
|
|
#include <LibCore/System.h>
|
|
#include <LibMain/Main.h>
|
|
#include <csignal>
|
|
#include <ctype.h>
|
|
#include <fcntl.h>
|
|
#include <stdio.h>
|
|
#include <sys/ioctl.h>
|
|
#include <termios.h>
|
|
#include <unistd.h>
|
|
|
|
static struct termios g_save;
|
|
|
|
// Flag set by a SIGWINCH signal handler to notify the main loop that the window has been resized.
|
|
static Atomic<bool> g_resized { false };
|
|
|
|
static ErrorOr<void> setup_tty(bool switch_buffer)
|
|
{
|
|
// Save previous tty settings.
|
|
g_save = TRY(Core::System::tcgetattr(STDOUT_FILENO));
|
|
|
|
struct termios raw = g_save;
|
|
raw.c_lflag &= ~(ECHO | ICANON);
|
|
|
|
// Disable echo and line buffering
|
|
TRY(Core::System::tcsetattr(STDOUT_FILENO, TCSAFLUSH, raw));
|
|
|
|
if (switch_buffer) {
|
|
// Save cursor and switch to alternate buffer.
|
|
out("\e[s\e[?1047h");
|
|
}
|
|
|
|
return {};
|
|
}
|
|
|
|
static ErrorOr<void> teardown_tty(bool switch_buffer)
|
|
{
|
|
TRY(Core::System::tcsetattr(STDOUT_FILENO, TCSAFLUSH, g_save));
|
|
|
|
if (switch_buffer) {
|
|
out("\e[?1047l\e[u");
|
|
}
|
|
|
|
return {};
|
|
}
|
|
|
|
static Vector<StringView> wrap_line(String const& string, size_t width)
|
|
{
|
|
Utf8View utf8(string);
|
|
Vector<size_t> splits;
|
|
|
|
size_t offset = 0;
|
|
|
|
bool in_ansi = false;
|
|
// for (auto codepoint : string) {
|
|
for (auto it = utf8.begin(); it != utf8.end(); ++it) {
|
|
if (offset >= width) {
|
|
splits.append(utf8.byte_offset_of(it));
|
|
offset = 0;
|
|
}
|
|
|
|
if (*it == '\e')
|
|
in_ansi = true;
|
|
|
|
if (!in_ansi) {
|
|
if (*it == '\t') {
|
|
// Tabs are a special case, because their width is variable.
|
|
offset += (8 - (offset % 8));
|
|
} else {
|
|
// FIXME: calculate the printed width of the character.
|
|
offset++;
|
|
}
|
|
}
|
|
|
|
if (isalpha(*it))
|
|
in_ansi = false;
|
|
}
|
|
|
|
Vector<StringView> spans;
|
|
size_t span_start = 0;
|
|
for (auto split : splits) {
|
|
spans.append(string.substring_view(span_start, split - span_start));
|
|
span_start = split;
|
|
}
|
|
spans.append(string.substring_view(span_start));
|
|
|
|
return spans;
|
|
}
|
|
|
|
class Pager {
|
|
public:
|
|
Pager(StringView filename, FILE* file, FILE* tty, StringView prompt)
|
|
: m_file(file)
|
|
, m_tty(tty)
|
|
, m_filename(filename)
|
|
, m_prompt(prompt)
|
|
{
|
|
}
|
|
|
|
void up()
|
|
{
|
|
up_n(1);
|
|
}
|
|
|
|
void down()
|
|
{
|
|
down_n(1);
|
|
}
|
|
|
|
void up_page()
|
|
{
|
|
up_n(m_height - 1);
|
|
}
|
|
|
|
void down_page()
|
|
{
|
|
down_n(m_height - 1);
|
|
}
|
|
|
|
void up_n(size_t n)
|
|
{
|
|
if (m_line == 0 && m_subline == 0)
|
|
return;
|
|
|
|
line_subline_add(m_line, m_subline, -n);
|
|
|
|
full_redraw();
|
|
}
|
|
|
|
void down_n(size_t n)
|
|
{
|
|
if (at_end())
|
|
return;
|
|
|
|
clear_status();
|
|
|
|
read_enough_for_line(m_line + n);
|
|
|
|
size_t real_n = line_subline_add(m_line, m_subline, n);
|
|
|
|
// If we are moving less than a screen down, just draw the extra lines
|
|
// for efficiency and more(1) compatibility.
|
|
if (n < m_height - 1) {
|
|
size_t line = m_line;
|
|
size_t subline = m_subline;
|
|
line_subline_add(line, subline, (m_height - 1) - real_n, false);
|
|
write_range(line, subline, real_n);
|
|
} else {
|
|
write_range(m_line, m_subline, m_height - 1);
|
|
}
|
|
|
|
status_line();
|
|
|
|
fflush(m_tty);
|
|
}
|
|
|
|
void top()
|
|
{
|
|
m_line = 0;
|
|
m_subline = 0;
|
|
full_redraw();
|
|
}
|
|
|
|
void bottom()
|
|
{
|
|
while (read_line())
|
|
;
|
|
|
|
m_line = end_line();
|
|
m_subline = end_subline();
|
|
full_redraw();
|
|
}
|
|
|
|
void up_half_page()
|
|
{
|
|
up_n(m_height / 2);
|
|
}
|
|
|
|
void down_half_page()
|
|
{
|
|
down_n(m_height / 2);
|
|
}
|
|
|
|
void go_to_line(size_t line_num)
|
|
{
|
|
read_enough_for_line(line_num);
|
|
|
|
m_line = line_num;
|
|
m_subline = 0;
|
|
bound_cursor();
|
|
full_redraw();
|
|
}
|
|
|
|
void init()
|
|
{
|
|
resize(false);
|
|
}
|
|
|
|
void resize(bool clear = true)
|
|
{
|
|
// First, we get the current size of the window.
|
|
struct winsize window;
|
|
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &window) == -1) {
|
|
perror("ioctl(2)");
|
|
return;
|
|
}
|
|
|
|
auto original_height = m_height;
|
|
|
|
m_width = window.ws_col;
|
|
m_height = window.ws_row;
|
|
|
|
// If the window is now larger than it was before, read more lines of
|
|
// the file so that there is enough data to fill the whole screen.
|
|
//
|
|
// m_height is initialized to 0, so if the terminal was 80x25 when
|
|
// this is called for the first time, then additional_lines will be 80
|
|
// and 80 lines of text will be buffered.
|
|
auto additional_lines = m_height - original_height;
|
|
while (additional_lines > 0) {
|
|
if (!read_line()) {
|
|
// End of file has been reached.
|
|
break;
|
|
}
|
|
--additional_lines;
|
|
}
|
|
|
|
reflow();
|
|
bound_cursor();
|
|
|
|
// Next, we repaint the whole screen. We need to figure out what line was at the top
|
|
// of the screen, and seek there and re-display everything again.
|
|
if (clear) {
|
|
full_redraw();
|
|
} else {
|
|
redraw();
|
|
}
|
|
}
|
|
|
|
size_t write_range(size_t line, size_t subline, size_t length)
|
|
{
|
|
size_t lines = 0;
|
|
for (size_t i = line; i < m_lines.size(); ++i) {
|
|
for (auto string : sublines(i)) {
|
|
if (subline > 0) {
|
|
--subline;
|
|
continue;
|
|
}
|
|
if (lines >= length)
|
|
return lines;
|
|
|
|
outln(m_tty, "{}", string);
|
|
++lines;
|
|
}
|
|
}
|
|
|
|
return lines;
|
|
}
|
|
|
|
void clear_status()
|
|
{
|
|
out(m_tty, "\e[2K\r");
|
|
}
|
|
|
|
void status_line()
|
|
{
|
|
out(m_tty, "\e[0;7m ");
|
|
render_status_line(m_prompt);
|
|
out(m_tty, " \e[0m");
|
|
}
|
|
|
|
bool read_line()
|
|
{
|
|
char* line = nullptr;
|
|
size_t n = 0;
|
|
ssize_t size = getline(&line, &n, m_file);
|
|
ScopeGuard guard([line] {
|
|
free(line);
|
|
});
|
|
|
|
if (size == -1)
|
|
return false;
|
|
|
|
// Strip trailing newline.
|
|
if (line[size - 1] == '\n')
|
|
--size;
|
|
|
|
m_lines.append(String(line, size));
|
|
return true;
|
|
}
|
|
|
|
bool at_end()
|
|
{
|
|
return feof(m_file) && m_line == end_line() && m_subline == end_subline();
|
|
}
|
|
|
|
private:
|
|
void redraw()
|
|
{
|
|
write_range(m_line, m_subline, m_height - 1);
|
|
status_line();
|
|
fflush(m_tty);
|
|
}
|
|
|
|
void full_redraw()
|
|
{
|
|
out("\e[2J\e[0G\e[0d");
|
|
redraw();
|
|
}
|
|
|
|
void read_enough_for_line(size_t line)
|
|
{
|
|
// This might read a bounded number of extra lines.
|
|
while (m_lines.size() < line + m_height - 1) {
|
|
if (!read_line())
|
|
break;
|
|
}
|
|
}
|
|
|
|
size_t render_status_line(StringView prompt, size_t off = 0, char end = '\0', bool ignored = false)
|
|
{
|
|
for (; off < prompt.length() && prompt[off] != end; ++off) {
|
|
if (ignored)
|
|
continue;
|
|
|
|
if (off + 1 >= prompt.length()) {
|
|
// Don't parse any multi-character sequences if we are at the end of input.
|
|
out(m_tty, "{}", prompt[off]);
|
|
continue;
|
|
}
|
|
|
|
switch (prompt[off]) {
|
|
case '?':
|
|
switch (prompt[++off]) {
|
|
case 'f':
|
|
off = render_status_line(prompt, off + 1, ':', m_file == stdin);
|
|
off = render_status_line(prompt, off + 1, '.', m_file != stdin);
|
|
break;
|
|
case 'e':
|
|
off = render_status_line(prompt, off + 1, ':', !at_end());
|
|
off = render_status_line(prompt, off + 1, '.', at_end());
|
|
break;
|
|
default:
|
|
// Unknown flags are never true.
|
|
off = render_status_line(prompt, off + 1, ':', true);
|
|
off = render_status_line(prompt, off + 1, '.', false);
|
|
}
|
|
break;
|
|
case '%':
|
|
switch (prompt[++off]) {
|
|
case 'f':
|
|
out(m_tty, "{}", m_filename);
|
|
break;
|
|
case 'l':
|
|
out(m_tty, "{}", m_line);
|
|
break;
|
|
default:
|
|
out(m_tty, "?");
|
|
}
|
|
break;
|
|
case '\\':
|
|
++off;
|
|
[[fallthrough]];
|
|
default:
|
|
out(m_tty, "{}", prompt[off]);
|
|
}
|
|
}
|
|
return off;
|
|
}
|
|
|
|
Vector<StringView> const& sublines(size_t line)
|
|
{
|
|
return m_subline_cache.ensure(line, [&]() {
|
|
return wrap_line(m_lines[line], m_width);
|
|
});
|
|
}
|
|
|
|
size_t line_subline_add(size_t& line, size_t& subline, int delta, bool bounded = true)
|
|
{
|
|
int unit = delta / AK::abs(delta);
|
|
size_t i;
|
|
for (i = 0; i < (size_t)AK::abs(delta); ++i) {
|
|
if (subline == 0 && unit == -1) {
|
|
if (line == 0)
|
|
return i;
|
|
|
|
line--;
|
|
subline = sublines(line).size() - 1;
|
|
} else if (subline == sublines(line).size() - 1 && unit == 1) {
|
|
if (bounded && feof(m_file) && line == end_line() && subline == end_subline())
|
|
return i;
|
|
|
|
if (line >= m_lines.size() - 1)
|
|
return i;
|
|
|
|
line++;
|
|
subline = 0;
|
|
} else {
|
|
subline += unit;
|
|
}
|
|
}
|
|
return i;
|
|
}
|
|
|
|
void bound_cursor()
|
|
{
|
|
if (!feof(m_file))
|
|
return;
|
|
|
|
if (m_line == end_line() && m_subline >= end_subline()) {
|
|
m_subline = end_subline();
|
|
} else if (m_line > end_line()) {
|
|
m_line = end_line();
|
|
m_subline = end_subline();
|
|
}
|
|
}
|
|
|
|
void calculate_end()
|
|
{
|
|
if (m_lines.is_empty()) {
|
|
m_end_line = 0;
|
|
m_end_subline = 0;
|
|
return;
|
|
}
|
|
size_t end_line = m_lines.size() - 1;
|
|
size_t end_subline = sublines(end_line).size() - 1;
|
|
line_subline_add(end_line, end_subline, -(m_height - 1), false);
|
|
m_end_line = end_line;
|
|
m_end_subline = end_subline;
|
|
}
|
|
|
|
// Only valid after all lines are read.
|
|
size_t end_line()
|
|
{
|
|
if (!m_end_line.has_value())
|
|
calculate_end();
|
|
|
|
return m_end_line.value();
|
|
}
|
|
|
|
// Only valid after all lines are read.
|
|
size_t end_subline()
|
|
{
|
|
if (!m_end_subline.has_value())
|
|
calculate_end();
|
|
|
|
return m_end_subline.value();
|
|
}
|
|
|
|
void reflow()
|
|
{
|
|
m_subline_cache.clear();
|
|
m_end_line = {};
|
|
m_end_subline = {};
|
|
|
|
m_subline = 0;
|
|
}
|
|
|
|
// FIXME: Don't save scrollback when emulating more.
|
|
Vector<String> m_lines;
|
|
|
|
size_t m_line { 0 };
|
|
size_t m_subline { 0 };
|
|
|
|
HashMap<size_t, Vector<StringView>> m_subline_cache;
|
|
Optional<size_t> m_end_line;
|
|
Optional<size_t> m_end_subline;
|
|
|
|
FILE* m_file;
|
|
FILE* m_tty;
|
|
|
|
size_t m_width { 0 };
|
|
size_t m_height { 0 };
|
|
|
|
String m_filename;
|
|
String m_prompt;
|
|
};
|
|
|
|
/// Return the next key sequence, or nothing if a signal is received while waiting
|
|
/// to read the next sequence.
|
|
static Optional<String> get_key_sequence()
|
|
{
|
|
// We need a buffer to handle ansi sequences.
|
|
char buff[8];
|
|
|
|
ssize_t n = read(STDOUT_FILENO, buff, sizeof(buff));
|
|
if (n > 0) {
|
|
return String(buff, n);
|
|
} else {
|
|
return {};
|
|
}
|
|
}
|
|
|
|
static void cat_file(FILE* file)
|
|
{
|
|
Array<u8, 4096> buffer;
|
|
while (!feof(file)) {
|
|
size_t n = fread(buffer.data(), 1, buffer.size(), file);
|
|
if (n == 0 && ferror(file)) {
|
|
perror("fread");
|
|
exit(1);
|
|
}
|
|
|
|
n = fwrite(buffer.data(), 1, n, stdout);
|
|
if (n == 0 && ferror(stdout)) {
|
|
perror("fwrite");
|
|
exit(1);
|
|
}
|
|
}
|
|
}
|
|
|
|
ErrorOr<int> serenity_main(Main::Arguments arguments)
|
|
{
|
|
TRY(Core::System::pledge("stdio rpath tty sigaction"));
|
|
|
|
// FIXME: Make these into StringViews once we stop using fopen below.
|
|
String filename = "-";
|
|
String prompt = "?f%f :.(line %l)?e (END):.";
|
|
bool dont_switch_buffer = false;
|
|
bool quit_at_eof = false;
|
|
bool emulate_more = false;
|
|
|
|
if (LexicalPath::basename(arguments.strings[0]) == "more"sv)
|
|
emulate_more = true;
|
|
|
|
Core::ArgsParser args_parser;
|
|
args_parser.add_positional_argument(filename, "The paged file", "file", Core::ArgsParser::Required::No);
|
|
args_parser.add_option(prompt, "Prompt line", "prompt", 'P', "Prompt");
|
|
args_parser.add_option(dont_switch_buffer, "Don't use xterm alternate buffer", "no-init", 'X');
|
|
args_parser.add_option(quit_at_eof, "Exit when the end of the file is reached", "quit-at-eof", 'e');
|
|
args_parser.add_option(emulate_more, "Pretend that we are more(1)", "emulate-more", 'm');
|
|
args_parser.parse(arguments);
|
|
|
|
FILE* file;
|
|
if (String("-") == filename) {
|
|
file = stdin;
|
|
} else if ((file = fopen(filename.characters(), "r")) == nullptr) {
|
|
perror("fopen");
|
|
exit(1);
|
|
}
|
|
|
|
// On SIGWINCH set this flag so that the main-loop knows when the terminal
|
|
// has been resized.
|
|
signal(SIGWINCH, [](auto) {
|
|
g_resized = true;
|
|
});
|
|
|
|
TRY(Core::System::pledge("stdio tty"));
|
|
|
|
if (emulate_more) {
|
|
// Configure options that match more's behavior
|
|
dont_switch_buffer = true;
|
|
quit_at_eof = true;
|
|
prompt = "--More--";
|
|
}
|
|
|
|
if (!isatty(STDOUT_FILENO)) {
|
|
cat_file(file);
|
|
return 0;
|
|
}
|
|
|
|
TRY(setup_tty(!dont_switch_buffer));
|
|
|
|
Pager pager(filename, file, stdout, prompt);
|
|
pager.init();
|
|
|
|
StringBuilder modifier_buffer = StringBuilder(10);
|
|
for (Optional<String> sequence_value;; sequence_value = get_key_sequence()) {
|
|
if (g_resized) {
|
|
g_resized = false;
|
|
pager.resize();
|
|
}
|
|
|
|
if (!sequence_value.has_value()) {
|
|
continue;
|
|
}
|
|
|
|
auto const& sequence = sequence_value.value();
|
|
|
|
if (sequence.to_uint().has_value()) {
|
|
modifier_buffer.append(sequence);
|
|
} else {
|
|
if (sequence == "" || sequence == "q") {
|
|
break;
|
|
} else if (sequence == "j" || sequence == "\e[B" || sequence == "\n") {
|
|
if (!emulate_more) {
|
|
if (!modifier_buffer.is_empty())
|
|
pager.down_n(modifier_buffer.build().to_uint().value_or(1));
|
|
else
|
|
pager.down();
|
|
}
|
|
} else if (sequence == "k" || sequence == "\e[A") {
|
|
if (!emulate_more) {
|
|
if (!modifier_buffer.is_empty())
|
|
pager.up_n(modifier_buffer.build().to_uint().value_or(1));
|
|
else
|
|
pager.up();
|
|
}
|
|
} else if (sequence == "g") {
|
|
if (!emulate_more) {
|
|
if (!modifier_buffer.is_empty())
|
|
pager.go_to_line(modifier_buffer.build().to_uint().value());
|
|
else
|
|
pager.top();
|
|
}
|
|
} else if (sequence == "G") {
|
|
if (!emulate_more) {
|
|
if (!modifier_buffer.is_empty())
|
|
pager.go_to_line(modifier_buffer.build().to_uint().value());
|
|
else
|
|
pager.bottom();
|
|
}
|
|
} else if (sequence == " " || sequence == "f" || sequence == "\e[6~") {
|
|
pager.down_page();
|
|
} else if ((sequence == "\e[5~" || sequence == "b") && !emulate_more) {
|
|
pager.up_page();
|
|
} else if (sequence == "d") {
|
|
pager.down_half_page();
|
|
} else if (sequence == "u" && !emulate_more) {
|
|
pager.up_half_page();
|
|
}
|
|
|
|
modifier_buffer.clear();
|
|
}
|
|
|
|
if (quit_at_eof && pager.at_end())
|
|
break;
|
|
}
|
|
|
|
pager.clear_status();
|
|
|
|
TRY(teardown_tty(!dont_switch_buffer));
|
|
return 0;
|
|
}
|